Automatically upgrade buildings by hand or with construction robots.
Providing the player with new tools or adjusting the game interface, without fundamentally changing gameplay.
After using the Upgrade Planner to upgrade a miniloader from fast to express and then switching the direction of that miniloader a crash happens.
Please have a look into the discussion I had with therax, the author of miniloader:
https://mods.factorio.com/mod/miniloader/discussion/6026ba263d99e3a8e0e14d17
